1 Small-Scale Implementation of Magnetic Levitation Train Nathan Black Ben James Greg Koo Vivek Kumar Preston Rhea Wednesday, April 22, 2009

2 Overview Objectives: Levitation Stabilization Propulsion Proof-of-concept Build awareness Project cost: $523

4 State-of-the-Art: AMT American Maglev Tech.NameTeam Maglev 125 mphTop Speed1.4 ft/s 50 tonsWeight0.5 lb < $20 Million/MileCost$523

System Components AC Drive LSM Track rails AC Drive LSM AC Reactor Power Resistors Track Rails

Design Changes – Levitation, Stabilization Track rails with magnets –Magnets spin along one rail –Ball bearings –Spacers –Optimal rail spacing

Design Changes - Propulsion LSM Windings –5 wires per phase (18 gauge) to increase magnetic field strength of LSM –Provide uniform propulsion Train Car –Halbach array 4 disc magnets

7 Performance – AC Drive Sinusoidal output current desired AC reactor utilized to smooth drive output Peak output current: 10 A Output Voltage:208Vrms Frequency range used: 2.7 Hz – 5.5 Hz

8 Performance – LSM Secondary Lorentz ForceI= 10 A, B= 1.2 T, L= m Secondary Primary Max Force (single wire) Force (5 wires) = 0.051*5 = 0.255lbf

11 Performance – LSM Optimal air gap: 2 mm Max air gap: 4 mm Current: 9.1 A Frequency: 5.5 Hz

4 Design Objectives CriteriaProposed Specifications Achieved Specifications LevitationNo contact between train and track Vertical levitation with horizontal contact Vertical Stability+/- 6 mm+/- 1 mm Horizontal Stability +/- 4 mm+/- 0 mm Torsional Stability +/- 10 degrees+/- 0 degrees Propulsion0 - 5 mph0 -1 mph Train LoadingMust support 0.5 lbsSupported 0.11 lb

4 Material Costs ProductCost Neodymium Magnets Free Magnetic Strip$ Gauge Wire $70 AC Drive$255 AC ReactorFree Balsa Wood$5 Bearings$13 Total Cost$523

11 Discussion – Project Conclusion 2 failed designs Pseudo-maglev achieved Good platform for future senior design projects Our Design Electrodynamic Suspension

11 Future Project - Video

Video

13 Questions?